Utility knife



FIG. 1 is a perspective view of a utility knife showing my new design;

FIG. 2 is another perspective view of the utility knife;

FIG. 3 is a top view thereof;

FIG. 4 is a bottom view thereof;

FIG. 5 is a right side view thereof, a left side being a mirror image;

FIG. 6 is a rear view thereof; and,

FIG. 7 is a front view thereof.

The broken lines are for illustrative purposes only and form no part of the claimed design. 

The ornamental design for the utility knife, as shown and described. 